Air-pump



(Model.) 2 Sheets- Sheet 1,

^ N. B. BLAGKMER.

AIR PUMP.

No. 256,276. 2 Patented Apr. 11,1882.

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2 sheets-sheet 2,.

(Model.)

N. B. BLAGKMER.

AIR PUMP.

Patented Apr. 11,1882.

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UNITED STATES l NAPOLEON n. BLAGKMER,

APATENT OFFICE.

0F PORTAGE, VISCONSIN.

AIR-PUMP.v

SLEECIFICATION forming part of 4Letters Patent No. 256,276, dated April11, 1882.

Application led July l5, 1881. (Model.)

To all Iwhom it may concern: n

Beit known that I, NAPOLEON B. BLACK- MER, a citizen of the UnitedStates,.residing at Portage,iu the county of Columbia and State ofWisconsin, have invented a new'and useful Improvement in Air-Pumps, ofwhich the following is a specification. y

My invention relates toa class of air-pumps used to exhaust air from areceiver or other vessel; and the object of my improvements is to soconstruct it that with one cylinder and lonepiston the air may beexhausted from either end of the cylinder. the mechanism illustrated inthe accompany ing drawings, in which Figure l is a perspective view ofmy iinproved air-pump. Fig. 2 is a vertical central section of the same,the guide-rods and crossbar being in view. Figs. 3, 4, and 5 are detailviews ofthe disks which operate to cont-rol the inlet and exhaust portsof the cylinder.

The same letter indicates the same part wherever it occurs in theVdrawings.

My invention relates to the class of double acting air-pumps used toexhaust air from a receiver or other` vessel, and so constructed thatwith one cylinder and one piston air can be alternately exhausted fromthe receiver by both ends of the cylinder.

My invention consists in the peculiar construction and operation oi twoseries of disks applied to the ends ot the cylinder to control theadmission and expulsion of air, and of the mechanism by which said disksare operated automatically while the pump is in action, all ashereinafter more specifically set forth.

In the drawings, A marks the cylinder of the pump, attached tobase-plate Z, and provided with the head M at top.

B is the piston, composed of the lower plate, P', fixed to the end ofthe piston-rod,.the upper loose plate, R, and the elastic packingring Q,interposed between them. The piston is attached to the lower end of rodC, the upper end ofwhicli is threaded and passes through cross-bar E,attached to the top of guide-rods F F. A thumb-nut, T, is applied on theupper end of rod C, to draw it up or let it down, as required. A sleeve,S, held by a head,M,sur rounds the rod C and extends down to the Iattain this object by' loose plate R. It results from this constructionthat when by thumb-nut T the pistonrod C is drawn up the plate Pcompresses the packing-ring Q against plate It and expands it, so thatit bears tightly against the walls of the cylinder. Y H marks the leverby which'the pump is operated. It consists of a handle and a'ring whichsurrounds the cylinder, and is pivoted at V V to the Aguiderods F F.This lever is connected with the base of the cylinder by a link, G,pivoted at p to an eye on the ring H, and at p to lugs ou the base of'the cylinder.

0n the side ot' the upper and lower ends ot' the cylinder is a circularplate, I, (see Fig. 5,) provided with two holes, a b, about ninetydegrees apart, both leading into the interiorof the cylinder. This plateis stationary, and may be a part ofthe body of the cylinder. On its sideis placed a spring, s, with a hook at the end, as shown.

On plate I is placed a disk, K, Fig. 4, of the same diameter, andprovided with corresponding holes a b', but nearer together by thediameter of one hole. This disk has a squarel the hooked end oi' springsf On disk K is placed a disk, L, ot' which Fig. 8 is an inside view,the outer side being seen in Fig. 1. This disk has holes c2 b2, nearertogether by the diameter of one hole than the projects into and engageswith the notch nin disk K, but is smaller than the width of the notch bythe diameter of one hole. lt is also provided with the inlet and exhaustt' e, as shown in Fig. 1. Both the disks L and K turn on a stud, x,passing through their centers and entering the center of plate I. Thedisks on both ends ot' the cylinder have the same construction,arrangement, and operation, serving alternately to control the inlet andexhaust openings of the two ends ofthe cylinder, one exhausting whilethe other takes air. The outer disks, L L, are connected by a rod, N,pivoted to them at q q. This rod is provided with adjustable lugs o o',which alternately, as the lever His vibrated, engage with the slant-ring sides ot' a triangular cani, l?, attached to the inner side of thering of lever H.

notclnn, and two small notches, t t, to receive holes of disk K. It hasalso a lug, l, which rIhe vessel from which the air is to be pumped isto be connected to the inlet-pipes@l t' by rubber tubes.

It operates as follows: rlhe motion ofthe lever is by the guide-rods andcross-head communicated to the piston. up, the air rushes in behind itthrough the rubber hose from any vessel to which it may be attacheduntil near the end of the stroke, when the lug p engages with the lug oat the upper end of the connecting-rod and changes the disks. The air isexhausted from behind the piston and expelled in front ot' it. It isnecessary that in changing the disks the aperture through which the airis being expelled should Vremain open until the close of the stroke,

while behind the piston the exhaust should close before the air rushesin behind the piston when the disks change, that the exhaust shouldclose rst and open rst. This is accomplished by the disk K having thenotch to engage with the lug on L. The three holes ct a a2 being inline, and L, Fig. 3, receiving the motion from the connecting-rod, movestirst, carrying 1.2L nearly ot'f from a K and b2 L in line with b K. Thelug then engages in notch in K and carries K until u K passes off fromThe piston movingI other side of the notch and brings a. K and a' I inline and b K and b I out, ready for the reverse stroke of the piston.

I claim as my invention and desire t0 secure by Letters Patentl. Thecombination, with the piston and its rod, of the cross-head, guide-rods,lever, and

link, substantially as and for the purposes herein specified.

2. -The combination, with the flexible packingwring, ot' the piston,rod, plate, sleeve, screw, cross-head, and nut, as set forth,substantially as and for the purposes specified.

3. In an air-pump, two sets of cut-off disks, each set being providedwith holes adapted to register, as described, in combination with anoperating-lever and a connecting-rod, Whereby the sets are alternatelyworked, as set forth. Y N. B. BLAGKMER.

WVitnesses:

J. S. BUEL, L. A. RANDALL.

